url to open question tab with a tag automatically filled

edit

My need is to include direct links than open the new question tab in several websites.

That's easy, the url is for example :

http://askbot.org/en/questions/ask/

But I would like to automatically add a tag depending on the initial site.

For instance, if the website is talking about cmake, the link could be as follow :

http://askbot.org/en/questions/ask/?tags=cmake